I don't work for CSI... just have a very analytical mind and over 30 years of experience with computers, ...and firearms. as for the 'g', it also appears to me that the lower part of the 'g' may have been buffed or lightened by removal of pitting in that area... but this is just a guess, but I can see pitting in the area that you swabbed with a white substance to make the stamps show up better in the photo.
but that is just my 
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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